const oracledb = require('oracledb');
var oracleConfig = require('../config/oracle.js').oracleConfig;

oracledb.fetchAsString = [ oracledb.CLOB ];
oracledb.fetchAsBuffer = [ oracledb.BLOB ];


function editError(err){
    var newError = err;
    var newErrorString = '';
    if(newError.indexOf("\n")!=-1){
        var indexColon = newError.indexOf(":")+1;
        var indexNewLine = newError.indexOf("\n");
        var newErrorSubString = newError.substring(0, indexNewLine);
        newErrorSubString = newErrorSubString.substring(indexColon, newErrorSubString.length);
        newErrorString = newErrorSubString;
    }else{
        var indexColon = newError.indexOf(":")+1;
        newError = newError.substring(indexColon, newError.length);
        newErrorString = newError;
    }

    return newErrorString.substring(newErrorString.indexOf('.','start')+1);
}

async function getData(query,params = {},options = {}){
    let conn;
    let error = [];
    var result;

    var queryOptions = {
        outFormat:oracledb.OBJECT
    }
    for(key in options){
        queryOptions[key] = options[key];
    }

    try{
        conn = await oracledb.getConnection(oracleConfig);
        var data = await conn.execute(query,params,queryOptions);
        result = {"STATUS" : 1 , "DATA" : data.rows};
        return result;
        

    }
    catch(e){
        result = {"STATUS" : 0 , "DATA" : e.message};
        return result;
    }
    finally{
        if(conn){
            try{
                await conn.close();
            }
            catch(e){
                result = {"STATUS" : 0 , "DATA" : e.message};
                return result;
                
            }
        }
    }
}

async function runQuery(query, params,user_id = null,owner = null) {
    let conn;
    var result;
    try{
        conn = await oracledb.getConnection(oracleConfig);
        // var query = `BEGIN ${owner}.General_SYS.Init_Fnd_Session__(UPPER(:user_login)); END;`;
        // var par = {user_login:user_id};
        // console.log('Inserted');

        // await conn.execute(query,par);
        data = await conn.execute(query,params,{ outFormat: oracledb.OBJECT });

        await conn.commit();
        result = {"STATUS":1,"DATA":data};
    }
    catch(e){
        await conn.rollback();
        result = {"STATUS":0,"DATA":e.message};

    }
    finally{
        if(conn){await conn.close()};
        return result;
    }

};


async function getConnection(){
    try{
        let conn;
        conn = await oracledb.getConnection(oracleConfig);
        return conn;
    }
    catch(e){
        console.log(e.message);
        throw editError(e.message);
    }
}


async function getQueryData(conn,query, params,user_id = null,owner = null){
    try{
        var data = await conn.execute(query,params,{ outFormat: oracledb.OBJECT });
        return data.rows;        
    }
    catch(e){
        throw editError(e.message);
    }
}

async function runQueryData(conn,query, params,user_id = null,owner = null){
    try{
        var data = await conn.execute(query,params,{ outFormat: oracledb.OBJECT });
        return data;        
    }
    catch(e){
        throw editError(e.message);
    }
}

async function runQueryMany(conn,query, params,user_id = null,owner = null){
    try{
        var data = await conn.executeMany(query,params,{ outFormat: oracledb.OBJECT });
        return data;        
    }
    catch(e){
        throw editError(e.message);
    }
}

async function doCommit(conn){
    try{
        var connection = conn;
        await connection.commit();
    }
    catch(e){
        throw editError(e.message);
    }
};

async function doRelease(conn){
    try{
        var connection = conn;
        await connection.close();
    }
    catch(e){
        throw editError(e.message);
    }
}

async function doRollBack(conn){
    try{
        var connection = conn;
        await connection.rollback();
        await conn.close();
    }
    catch(e){
        throw e;
    }
}


module.exports = {
    getData : getData,
    runQuery : runQuery,
    getConnection : getConnection,
    getQueryData : getQueryData,
    runQueryData : runQueryData,
    runQueryMany : runQueryMany,
    doCommit : doCommit,
    doRelease : doRelease,
    doRollBack : doRollBack
}